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反复发作的严重房室交接处心动过速,药物治疗往往无效。这类心律失常需要在电学上分离心房和心室的传导系统,随后应用人工心脏起搏,从而控制心室率。目前已有许多切断传导系统的方法,诸如化学和机械破坏法、手术分离、人为室间隔梗塞术、电凝法、切除、室间隔切开和分离以及心内冷冻切断术。在这些方法中,有些应用于实验,有些已用于临床。为了避免由心内途径手术造成的病残率,作者设计出一种经开胸途径作冷冻法切断希氏束的新方法。材料和方法:选用杂种犬10条,体重20～21
Recurrent severe atrioventricular tachycardia, drug treatment is often ineffective. Such arrhythmias require the electrical separation of the atrial and ventricular conduction systems followed by artificial cardiac pacing to control the ventricular rate. There are many ways to cut off conductive systems such as chemical and mechanical disruption, surgical separation, artificial interventricular septal infarction, electrocoagulation, resection, septal dissection and septation, and intracardiac cryosection. Some of these methods are used in experiments and some in clinical practice. To avoid morbidity due to endocardial surgery, the authors devised a new method of transecting His bundle by the thoracotomy approach. Materials and Methods: 10 hybrid dogs were selected, weighing 20-21